I have a friend that is an equine science major and had a rehab clinic up by Colorado State University. When my pony George foundered, which he does regularly, she put some nitroglycerian cream on a piece of gauze and put it on George's pastern, on the back where the hoof meets leg, and taped it on. Both fronts, by the way. Evidently, it stops the pulses from pounding and helps with pain. When I used the nitro, George got over this episode of founder within a couple of weeks, as opposed to the usual months. It really was amazing. Go back through the posts, lots of good information in there.
Heheh. Yeah. I saw all the post after I asked the question. Sorry. :-)